INDEX TO VOLUME 20 Leading articles are in bold face type; notes, abstracts and re- views are in ordinary type. Only minerals for which definite data are given are indexed. Accessory mineral suites ln Andesite,altered (analysis).... 245 granites of Missouri. (Tol- Ankerites of Northumberland. man, Koch) 208 (Hawkes,Smythe). 314 Adamite from Gold Hill, Tooele Anorthite from California. Co., Utal. (Staples) .200, 37r (Miller) 139 Ahlfeldite. (Ramdohr). 678 Apophyllite from East Lothian. Albite (optical data).. .....235, (Anderson,Elder). 314 Alderman, A. R.. 65 Architectural, Structural and Alexander, A. E. Opalized Monumental Stones of spherulesfrom Utah?. 602 Minnesota.(Thiel, Dutton) 208 [Book review]. 883 Alleghanyite, chemical forrnula Argillaceous sediments, tech- and crystal system. nique for investigating, @ogers). ......25, t97 (Bray, Grim and Kerr). 2O2 Allen, V. T. Memorial of Ste- Armstrong, E. J. Schroeckinger- phen Richarz. 184 ite from Bedford,N. Y.. 62 Almandine from Botallack, Arsenides and antimonides of Cornwall (analysis).Alder- Ni and Co, x-ray study of. man).. 65 (Holmes) ........ 198 Aloisi, P. Application of deter- Arsenopyrite(crystals).... ... 2l minants to crystallogra- Asbestos, barite, corundum, phv... 400 rutile and vermiculite in a-monochlornapthalene:meth- Pennsylvania.(Stone).... 198 ylene iodide series.(Buer- Augelite from Mono Co., Calif' ger) .. 199 (Lemmon). 664 a-uranopilite.(Novddek). .. 813 Aurosmirid.(Zviagincev).... 740 a-uranotile.(Novddek). 813 Austinite, a new arsenate from Arnazonite aplite dike from -l o:11'lliili%,,,, Laborador.(Wheeler). +4 "'11' Amber from Manitoba. (Walk- er)... ... 195 Bain,G.W..... 205 Amick,H. C.. 204 Bannister,F. A....65, 316,317, 811 Aminoff,G..... .tlJ Barite in red beds in Colorado. Amphibole from Purcell sills, (Howland) 199 British Columbia (analy- Barnes, W. II. an<l Wendling' sisand optical data).(Rice) 307 A. V. Laue symmetry ex- Anderson, C. A. Alteration of hibited by orthogonal crys- lavas surrounding hot tals. 253 springs in Lassen Volcanic Barth, T. F. W' and Ksandat National Park 240 C. J. Structure of dickite Anderson,J.G.C.. 314 and other clay minerals. 631 887 888 THE AMERICIN MINERALOGIST 209 CaO-MgO-SiO, system. (Tay- Bauer,L. H.. 197 lor, Williams) 209 Behre,C. H., Jr. 202 Carbon dioxide determination, Benn,J. H. Occurrenceof viv- newapparatus for. (Hey). 314 ianite in District of Co- Celestite and fluorite at Clay lumbia..... 311 Center, Ohio, occurrence Berman,H. 197,2Il and origin of. (Morrison) 780 Bernal,J. D. 811 Celestite from Chittenango Bertrandite. 747 tr'alls,N. Y. (Thibault) . 147 Beryl (analysis and optical Ces6ro,G. 541 'W'illiams, data).. l7 , 234, 747 Chapman,R. W. and Biotite (analysis and optical C, R. Evolution of White data).. 20, 512, 748 Mountain magma series 502 Biotite system.(Winchell). 773 Chloropal. 475 Bismoclite.(Mountain). 474,813 Chondrodite from Inverness- Bismuth minerals, new, from shire.(Itead, Double) 314 S.Africa. (Mountain) . 474 Chrom-beidellite. ' (Serdiu- Bismuth oxyhalides, crystal chenko) 541 structure of. (Bannister) 65 Chrom-nontronite. (Serdiu- Blockite.(Ramdohr) 678 chenko). 541 Blggild, O. B. 138 Chromite group. (Wishart) 2r0 Blgvad, R.. 137 Cobalto-sphiirosiderite.(Reiss- Boksputite.(Mountain) +74,814 ner) 814 Bowen, N. L. and Schairer, J. F. Colony, R. J. Schiller struc- Grrinerite from Rockport, ture .201, 828 Mass., and a seriesof syn- .. 195 tlreticfluor-amphiboles. 543 Color photography in miner- . 197, 20r, 208 alogy. (Shaub). 199 Bravais space-lattices,deriva- Color reactionsin micro-chemi- tion of. (Ramsdell) 2ll cal determinationof miner- Bray, R. H.. 202 als.(Watson) 65 Bryant, W. M. D. Crossed Coloradopegmatites.(Landes). 319 axial plane dispersion in Conant, L. C. Opticallv positive two organic compounds. cordieritefrom New Hamp- A peculiar extinction phe- shire. 310 nomenon. 281 Contactmetamorphic zone from Buerger, M. J. Unit cell and Little Belt Mts., Montana. spacegroupof.reaLgar. 36 (Taylor). 12O 196,212 Cooke,S. R. B. and Doan,D. J. Buerger,N. W.. 199 Mineragraphy and x-ray Burkeite, a new mineral from analysis of stainierite from Searles Lake, Calif. Swansea Mine, Good- (tr'oshag) 50 springs,Nevada. 27+ Burwash,E. M. 205 Copper ore minerals, identifi- Butler, R. D. 203 cationof,byx-rays.(Waldo) 575 Cordierite, optically positive, Calaverite,crystal structure of. from New Hampshire. (Tunell, Ksanda) 2Il (Conant) . 310 JOURNAL MINERALOGICAL SOCIETY OF AMERICA 889 Crazy Mountains of Montana. formation by means of (woltr) t93 heavyminerals.(Alexander) 208 Crestmore,Calif., paragenesis Distribution of heavy minerals of mineral assemblage at. in the clays of New JerseY. (Daly).. 638 (Ilawkins) .208,334 Crossed axial plane dispersion Doan, D. J. and Cooke,S. R. B' in two organic compounds. Mineragraphy and x'raY A peculiar extinction phe- analysis of stainierite from nomenon.(Bryant). ... 28t Goodsprings,Nevada.... 274 Crystal cavities in lavas from Donnay, J. D. H. Application the Hawaiian Islands. of determinantsto crYstal- (Dunham)... .... 880 lography 601 Crystal classification and sym- 2tl bolism.@isher). .... 21I,292 Double,I. S.. 3I4 Crystal forms, tabulation of, Drosdoff, M. and Truog, E' and discussion of form Removal of iron oxide names.(Rogers).. .... 838 coatingsfrom minerals. ' . 669 Crystal growth and solution Dunham, K. C. Crystal cavi- under local stress.(Russell) 733 ties in lavasfrom Hawaiian Crystal structure of zoisite 106 Islands. " ' 880 Crystailographic elements, Dutton, C. E. and Thiel, G. A. choiceof.(Peacock).. .. 212 Architectural, Structural Crystallographic expressionof and Monumental Stones the resultsof the theory of of Minnesota. IBook re- spacegroups. (Howard) 212 viewl..... 883 D'Achiardi,G.. 403 Eardtey, A. J. Book review. 402 Dacite (analysis). 244 Edelsteineund Schmucksteine. Dahllite from Ishawooa, VIy- (Eppler) fBook review]. 401 oming, spherulitic concre- Elder,S.. 3l+ tions of. (McConnell). .200,693 Enargite and plumbojarositeat Daly, J. W. Paragenesis of the Picher, Oklahoma. (Ran- mineral assemblage at some)..... -200,799 Crestmore, Riverside Co., English, G. L. Getting ac- California. 638 quainted with minerals' DeLeenheer,L...... 813 lBook review]. 318 Denham,R. L. .. 202 Enstatite-hypersthene series, Determinants, application to revision of. (Walls) 474 crystallography. (Aloisi). 400 Epidote, anomaliesin analYtical Determinants, application to determination of water in. crystallography. (Donnay) 601 (Smethurst) 811 Dickite and other clay miner- Eppler, A. and Eppler W. Fr. als, sf;ucture of. (Ksanda, Edelsteine und Schmuck- Barth) . 631 steine.[Book review] . 401 Dickite from Pennsylvania Eppler, W. Fr. and Stutzer, O. (analysis). (Honess, Wil- Die Lagerstaetten der liams)........ 462 Edelsteine und Schmuck- Differentiation of Onondaga steine.[Bookreview]...,, 402 890 THE AMERICAN MINERALOGIST Ettringite, composition and Geology of Western San Gabriel crystal structure of. (Ber- Mts. of California. (Miller) nal,Bannister)... 811 lBook reviewl. 402 Gettingacquainted with nriner- Faratsihite... 475 als. (English) fBook re- Ferri-paraluminite. (Pilipenko) 404 viewl . 318 Fisher, D. J. Crystal classifica- Ginorite.( D'Achiardi). 403 tion and symbolism... 211,292 Glass, J. J. Pegmatite minerals Fluid inclusions in sphalerite from near Amelia, Va,. 7+r and galena from Joplin. 469 (Smith)...... .. ..... 204 196 Fluor-amphiboles, synthetic. Glauconite and mica, structilral (Bowen,Schairer). ..197, 543 relationship of. (Gruner). 699 Fluorescence,petrographic use Goldich, S. S. and Tolmaa, C. of.(Quinn)..... 466 Granite, pegmatite and re- Fluorite and celestite at Clay placement veins at Gran- Center, Ohio. (Morrison). 780 iteville, Mo.. 229 Fluorite occurrence.(Russell). 313 Golding,E....... 65 Fluorite 749 Graham, W. A. P. Occurrence Foshag, W'. F. Burkeite, a new of narsarsukitein Montana 598 mineral from Searles Lake, Granite, pegmatite a.rrdreplace- Calif..... 50 ment veins in the Sheahan Foster, L. V. 210 quarry, Graniteville, Mo. Fraser, D. M. Microscopic (Tolman,Goldich) ...... 229 investigation of Friedens- Granitic intrusion in the St. ville, Pa., zinc ore. .203,45I Francois Mountain. ('fol- Friedel's law of mean indices. man, Denham). 202 (Donnay). 2II Greenalite, study of, (Joltiffe) Friedensville, Pa., zinc ore. 207,40s @raser). .203,451 Greene, G. U. Occurrence of Frondel, C. Size of crystals .. 469 sphaleriteatEllsworth, Ohio 882 Vectorial alteration of crys- Grill,E.. 740 tals.... 852 Grim, R. E.. 202 Fulgerites, origin and occur- Groves,A. W.. 316 rence in Atlantic coastal Gruner, J. W. Structural rela- plain. (Petty). 2A7 tionship of glauconite and Fusion relations of feldspath- mica... .. 699 oids, alkali feldspars and Structural relationship silica. (Schairer,Bowen) 201 of nontronites and mont- morillonite. 4lJ Garnet, spessartitic almandite Griinerite from Rockport, (analysis) 19 Mass., and a sefies of syn- Gehlenite(optical data). I24 thetic fluor-amphiboles. Genesisand structural relation @owen,Schaiier). .. .... 543 of Absaroka volcanics. Guarinite, clino and ortho. (Rouse). .. 206 (Ces6ro).. 541 Genetic relations of sphalerite Guild, F. N. Piedmontite in in pegmatite.(Ross)...... 203 Arizona. 679 JOURNAL MINERALOGICAL SOCIETY OF AMERICA 891 Gypsum crystals from Alfalfa Hurlbut, C. S. Jr. Dark inclu- Co., Okla. (Merritt).. 674 sions in tonalite from southernCalifornia. 2O5,609 Hall,G. M... .. 199,20+ Hyalosiderite (analysis and Hastingsite (analysisand opti- optical data). .. 512 cal data).. 512 Hydrocalumite.(Tilley)..